Samuel r



UNITED STATES PATENT OFFICE.

SAMUEL R, WILMOT, OF WATERTOIVN, CONNECTICUT, ASSIGNOR TO SAMUEL B. GUERNSEY.

DOOR-BOLT.

Specicaton of Letters Patent No. 17 474, dated June 2, 1857.

To all whom 'it may concern.:

Be it known that I, SAMUEL R. IVILMor, of llflatertown, in the county of Litchfield and State of Connecticut, have invented a new and useful Improvement in Bolts for Securing Doors and for other Purposes; and I do hereby declare that the following is a full, clear, and exact description of my said invention, reference -being had to the accompanying drawing, in which- Figure l represents a face view of one of my improved bolts; Fig. 2 is a similar view of the plate with the sliding bolt removed, and Figs. 3 and 4 are sections at the lines a: and y y of Fig. l.

My improvement has reference to the construction of the plate to which the sliding bolt is secured. It has been customary to make the plate of several pieces, consisting generally of the flat plate proper which lies upon the object to which the article is to be applied, and of the bars or bands which pass over the sliding bolts, hold it to the plate, and guide it when it is moved to and fro. These bars are generally riveted fast to the plate, but in some instances they have been constructed in such manner that the screws by which the article is secured to the door or other object pass both through the plate and through the prolonged extremities of the bars, thus securing the various parts of the article together and fastening it to the object. In either case the plate and bars are formed of several pieces and by distinct operations. The cost of making the plate and bars of separate pieces and at different operations is clearly much greater than it would be if the plate and bars could be made in one piece and at one operation; hence attempts have been made to form the plate with its bars 0f a single piece of metal by slit-ting the plate and raising up the slit portions from the re mainder, by the use of dies, to form the bars. So far as I am aware of, this method of forming the bars from the plat-e has been practically unsuccessful for the following reason. If we inspect a bolt plate it will at once be seen that, as the bolt lies upon the plate, the bar which crosses over the bolt must of necessity be longer than the correover the bolt. As the increase in length required to form the bar is considerable even in a bolt of small size the attempt t0 raise and stretch the bar by submitting the plate to the action of dies has been generally followed by the rupture of the metal of the bar, thus spoiling the plate.

The object of my invention is to permit the bars to be formed in one piece with the plate without straining the metal sutliciently to produce rupture; and it consists in corrugating or swaging t-he metal of the plate longitudinally on each side of the bolt, so thatthe portion of the plate which embraces the back half of the bolt is as long, or thereabout, as the bars which embrace the fronthalf of the bolt; hence the latte.` may be slit from the plate and raised up sutticiently to hold the bolt without danger of rupture by stretching.

The plate A of the bolt represented in the accompanying drawing is formed of one piece with the bars B B; the sides, c c, of the latter being separated from the remainder by slitting the plate, while the ends, c, c, of the bars remain attached to it. That portion of the plate which extends on each side of the bolt is swaged or corrugated as shown at, CZ CZ, so as to raise these portions of the plate from the remainder about half the height of the sliding bolt O, in the example represented; by this means the portion of the plate which extends between the highest parts of the corrugations, or from z' to c' in Fig. 3, around behind the bolt, is as long as the bar which extends between the highest parts of the corrugations, or from z' to z' in Fig. 4, across in front of the bolt; and con sequently the formation of the bar by raising it from the corrugated plate is not accompanied by the stretching of the metal to a degree sutlicient to create rupture; by this means therefore the plate and bars may be formed of a single piece of metal. In forming the plate the slits at the sides, c, c, of the bars may first be made; the corrugation of the plate and the raising of the bars may then be effected by submitting the plate to the action of dies; or the slitting of the bars and the forming or shaping of the plate may all be effected at one operation in properly formed dies. A tongue F is formed by punching that portion of the plate which lies beneath the bolt, and this tongue is slightly raised to form the spring which retains the bolt in the position to Which it may be moved. A slot m is also punched inthis portion of the plate to receive the end of the rivet Which secures the knob P of the bolt, and thus limits the distance to which the bolt can be moved.

It might upon a first View of the case Seem probable that the corrugation of the plate longitudinally Would strain the metal as much as the formation of the bars from the flat plate, and that the metal must be stretched injuriously to form the corrugations. This however is not the case, as the plate contracts'in Width as the corrugated parts are raised, thus showing that the metal is not stretched injuriously, but that its form is changed. If for example rectangular plates of the form represented by the lines, n, n, n, n, be subjected to the action of the dies, it Will be found that its outline has assumed the form represented by the curved dotted lines, 1', 1, fr, i", thus showing that a part of the metal has passed from the flat plate into the raised corrugations.

The corrugations not only afford the means of raising the bars from the plate but also form guides at .each side of the bolt; they also stiifen the plate longitudinally and improve its appearance, so that the Whole forms a neat and efficient article.

My invention is not o-f necessity confined to bolts, but may obviously be applied to other cases in Which it is desirable to raise up from a flat plate a bar Which is connected therewith at its ends but separated therefrom at its sides.

What I claim as my invention and desire SAMUEL R. WILMOT.

Vitnesses:

MARY E. CUTLER, LEMAN W. CU'rLnR. 

